People with depression often have hypersomnia, or excessive sleep, but still feel tired during the day. why might this be?

a. they tend to have less deep sleep and their rem sleep is less stable.
b. they tend to have no deep sleep, though their rem sleep is more stable.
c. they tend to have more deep sleep and their rem sleep is less stable.

Which of the following represents the results of a review of well-controlled studies of vitamin c supplementation on the resistance to, and recovery from, colds? there was a reduction in the duration of colds by 50% on the average. there was a slight effect on reducing the duration and severity of colds for people taking vitamin c supplements. there was a significant reduction in the duration of colds in people who consumed at least one gram a day. there was a significant reduction in the number of colds only in people who consumed > three grams per day.

What kind of wound occurred when the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin

Results from damage to tiny air sacs in the lungs